U.S. Geological Survey20091030Sprague River Oregon Centerline Sycan 1940vector digital dataPortland, ORU.S. Geological Surveyhttp://water.usgs.gov/lookup/getspatial?spragueriveroregon_centerline_sycan_1940The Sprague River drains 4090 square kilometers in south-central Oregon before flowing into the Williamson River and upper Klamath Lake. In cooperation with the U.S. Fish and Wildlife Service, the USGS and University of Oregon conducted a study to evaluate channel and floodplain processes for the 131 km of the Sprague River and its major tributaries, including the lower 20 km of the South Fork Sprague River, the lower 16 km of the North Fork Sprague River, and the lower 62 km of the Sycan River. The study involved multiple analyses, including assessments of historical channel change, riparian and floodplain vegetation, and surficial geology. To support these analyses, digital floodplain and channel maps were prepared from historic notes, maps, and aerial photos to depict channel and floodplain conditions at different times between 1866 and 2005. The geospatial database of current and historic channel and floodplain conditions will also enable evaluation of long-term trends pertaining to aquatic and riparian habitat conditions.These data were created to support understanding of geomorphic conditions and historical changes to channel and floodplain conditions for the Sprague River and the lower portions of its major tributaries. GIS layers depicting channel centerlines, water features, fluvial bars, floodplain vegetation, and floodplain features such as irrigation canals, levees and dikes, and roads were created from aerial photographs dating from 1940, 1968, and 2000. The purpose of this mapping was to track changes in channel and floodplain morphology and vegetation over time and to measure changes in channel position. Historical aerial photographs from 1940 and 1968 were acquired, scanned, and rectified for this project, while digital orthophotographs from 2000 are publicly available. (See metadata for each photograph set for more information on the rectification process and resolution of each dataset). In addition, channel centerlines were mapped from publicly available coverages for 1975 (Natural Resources Conservation Service Soil Survey of Klamath County) and 2005 (U.S. Department of Agriculture NAIP imagery). The surficial geologic mapping was done to support understanding of the geologic context of the modern floodplain, and encompasses the alluvial valleys of the Sprague River and the lower portions of the Sycan, North Fork, and South Fork Sprague Rivers.1940ground conditionCompleteNone planned
-121.331315
-121.268459
42.563213
42.460237Nonegeomorphologychannel analysisfloodplain analysisinlandWatersNoneSprague River OregonKlamath BasinNoneThe U.S. Geological Survey and the University of Oregon should be acknowledged as the data source in products derived from these data.Tana HaluskaU.S. Geological SurveyGeographermailing address2130 SW 5th AvenuePortlandOR97201USA503-251-3212N/A503-251-3470thaluska@usgs.gov(Warning: Although accurate at the time of production, this information may have become obsolete. See the Metadata_Reference_Information section for a current contact.)http://water.usgs.gov/GIS/browse/spragueriveroregon_centerline_sycan_1940.gifIllustration of data setGIFMicrosoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.3000Image evaluation and feature interpretation occurred at a scale of 1:10,000 - 1:500. Digitization of features occurred at a scale of 1:1,000.Topology rules were used to clean and edit features digitized within the floodplain boundary data set for overlap and boundary accuracy. A separate topology was run to edit digitizing overlap with the floodplain boundary data set and the features digitized within it to ensure all features were enclosed within the final floodplain boundary.Data are complete. River centerline is defined as a line digitized by eye that approximates the centerline of the Primary Channel for the Sprague, North Fork Sprague, South Fork Sprague and Sycan Rivers. Five different river centerlines were digitized from five year sets (1940s, 1968, 1975, 2000, 2005). For digitized year sets 1940s, 1968 & 2000, mid-channel bar features were ignored when delineating the centerline. Centerline was established as the point between the channel edges.A goal of an RMSE less than 5 meters was established for the georectification process. Photo scanning and DPI were calculated to ensure that 2000, 1968, and 1940 photo sets all had the same 1 meter pixel resolution.N/AU.S. Department of Agriculture1940Aerial Photographyremote-sensing image20,000digital aerial photography1940ground conditionUSDADAPUsed to digitize the 1940 river centerline.U.S. Geological Survey2000Digital Orthophoto Quadrangleremote-sensing image20,000digital orthophoto quadrangle2000ground conditionUSGSDOQ2000Used in the rectification process for the 1940 aerial photography.Data Acquisition: Remotely sensed imagery (historic aerial photos and LiDAR) researched and digital copies of the 1940s photo set were obtained from the National Archives2005Rectification: The photo rectification process warps an image across a set of specified points. The warping leaves the edges of the image less spatially accurate than the center portion of the image. To ensure the best accuracy of data, feature digitizing occurred nearest the center of the photo as possible on the rectified 1940s and 1968 photo sets. One photo was exchanged for a bordering photo at approximately the mid-point of photo overlap. Digitization on a photo's edge only occurred on the final most distal photo when there was no adjacent photo available. The historic 1940 aerial photo set rectified to the USGS 2000 DOQs. A goal of 20 ground control points (GCP) per photo was established (actual: 11-35 GCPs/photo). Hard point landscape features (building or fence corners) were prioritized for rectification, then "soft point" features (trees, etc.) were used. GCP selection prioritized points nearest the river and the active floodplain to ensure accuracy of rectification warping in the study area. A goal of an RMSE < 5m was established (actual: 1.75-4.5, with one outlier in a canyon section with and RMSE of 6.01). Rectification of photos used 2nd order polynomial.USDAAP40USGSDOQ20002005Digitizing: 1940 water features and river centerlines digitized. Completed in 2008. Digitizing Protocol: The Sprague River Project is focused on geomorphic and vegetation changes over time within the active geomorphic floodplain of the Sprague River watershed. We defined the active geomorphic floodplain as the area adjacent to the channel system that is low-lying and displays geomorphic features typical of channel erosion and depositional processes clearly on imagery, including aerial photos, 7.5 min USGS topo maps, and LIDAR images (Watershed Sciences, 2005). Geomorphic features used to define the extent of the active geomorphic floodplain included point bars, scroll bars, abandoned channels (including oxbows ponds and filled channels), and swell and swale topography. The active geomorphic floodplain was distinguished from adjacent alluvial surfaces that are smoother and show less evidence of erosion and deposition, although some of these adjacent surfaces may be flooded regularly by overbank flows. Digital data sets were first digitized from the 2000 DOQs. High resolution LiDAR imagery data (Watershed Sciences, 2005) was used to identify topographic details that assisted in feature classification. If the feature visible in the LiDAR was not visible in the 2000 DOQ the feature was not digitized. Additional comparison with the 1998 color air photo mosaic (USFWS 1998) aided in evaluating the 2000 DOQs. The 2000 digital data was then used as a template for digitizing features from the 1968 and 1940s photo sets. Because the spatial context of this project is focused within the active geomorphic floodplain, interpreting and digitizing the floodplain boundary was prioritized to define area of digitization in all three year sets. Original data sets were digitized in ArcMap as separate shapefiles (line or polygon). Line files were "buffered" in ArcMAP to generate polygons with a calculable area for these features. All digitizing was reviewed and edited by the graduate research assistants or project leaders for interpretation consistency and data accuracy. After editing, the shapefiles were input into a geodatabase. The geodatabase was used to organize the data sets by data type and subtype, feature prioritization, and topology rules.USDAAP402006Quality Assurance: Ran two stages of topology as discussed in the Logical Consistency Report2008VectorString1Universal Transverse Mercator100.999600-123.0000000.000000500000.0000000.000000coordinate pair0.0001000.000100metersNorth American Datum of 1983Geodetic Reference System 806378137.000000298.257222
SpragueRiverOregon_Centerline_Sycan_1940Sycan River centerline in 1940U.S. Geological SurveyOBJECTIDInternal feature number.ESRISequential unique whole numbers that are automatically generated.ShapeFeature geometry.ESRICoordinates defining the features.NOTE_NotesU.S. Geological SurveyNotesShape_LengthLength of feature in internal units.ESRIPositive real numbers that are automatically generated.U.S. Geological SurveyAsk USGS -- Water Webserver Teammailing address445 National CenterRestonVA20192USA1-888-275-8747 (1-888-ASK-USGS)http://water.usgs.gov/user_feedback_form.htmlDownloadable DataAlthough these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials. The use of firm, trade, or brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. The names mentioned in this document may be trademarks or registered trademarks of their respective trademark owners.ESRI Geodatabase Feature ClassPKZIP compressionWinzip1000http://water.usgs.gov/GIS/dsdl/SpragueRiverAnalysis.zipNone. This dataset is provided by USGS as a public service.20091116U.S. Geological SurveyAsk USGS -- Water Webserver Teammailing address445 National CenterRestonVA20192USA1-888-275-8747 (1-888-ASK-USGS)http://answers.usgs.gov/cgi-bin/gsanswers?pemail=h2oteam&subject=GIS+Dataset+spragueriveroregon_centerline_sycan_1940FGDC Content Standards for Digital Geospatial MetadataFGDC-STD-001-1998